fix lint errors in joist, phetsims/chipper#736

Author: zepumph

js/Profiler.js

@@ -33,6 +33,8 @@ define( function( require ) {
   // modules
   var inherit = require( 'PHET_CORE/inherit' );
   var joist = require( 'JOIST/joist' );
+  var Util = require( 'DOT/Util' );
+
 
   // constants
   var FIELD_SEPARATOR = ' \u2014 '; // em dash, a long horizontal dash
@@ -81,11 +83,11 @@ define( function( require ) {
         }
 
         // FPS
-        var averageFPS = Math.round( 1000 / (totalTime / this.allTimes.length) );
+        var averageFPS = Util.roundSymmetric( 1000 / (totalTime / this.allTimes.length) );
         var text = '' + averageFPS + ' FPS';
 
         // ms/frame
-        var averageFrameTime = Math.round( totalTime / this.allTimes.length );
+        var averageFrameTime = Util.roundSymmetric( totalTime / this.allTimes.length );
         text = text + FIELD_SEPARATOR + averageFrameTime + 'ms/frame';
 
         // histogram

js/splash.js

@@ -1,4 +1,5 @@
 // Copyright 2016-2018, University of Colorado Boulder
+/* eslint-disable bad-sim-text */
 
 /**
  * Shows the splash screen and loading progress bar.
@@ -42,6 +43,7 @@
 
     var scale = Math.min( scaleX, scaleY ) * SCALE_FACTOR;
 
+    // use Math.round because this is a preload
     var translationX = Math.round( ( availableWidth - currentWidth * scale ) / 2 );
     var translationY = Math.round( ( availableHeight - currentHeight * scale ) * POSITION_Y );
 
@@ -127,6 +129,8 @@
 
   // fade/glow the background of the loading bar
   var phetSplashScreenAnimationInterval = setInterval( function() {
+
+    // use browser toFixed because this is a preload
     progressBarBackground.style[ 'stroke-width' ] = ( Math.sin( Date.now() / 1000 * 4 ) * 0.55 + 1 ).toFixed( 2 );
   }, 16 );